Experimental Evaluation of Oxygen and Air Activated Sludge Nitrification Systems With and Without pH Control.

摘要

The nitrification capabilities of two oxygen activated sludge systems receiving District of Columbia secondary effluent at a steady state flow of 190cu m/day (50,000gpd) were evaluated. The pH of one system was controlled to maintain a pH of 7.0in the last reactor pass of the four-pass system. The pH of the second system was uncontrolled and reactor pH values of 5.5-6.0were common. Also parallel air and oxygen nitrification systems both with pH control were evaluated under similar operating conditions. Parameters used to compare the systems included effluent quality,sludge settling rates,lime dosage,sludge production and nitrification kinetic rates.